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H8SX/1663 数据表(PDF) 855 Page - Renesas Technology Corp |
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H8SX/1663 数据表(HTML) 855 Page - Renesas Technology Corp |
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855 / 1158 page ![]() Section 16 USB Function Module (USB) Rev.1.00 Jun. 07, 2006 Page 803 of 1102 REJ09B0294-0100 The data to be transmitted is written to the data register using this interrupt. After the first transmit data write for one FIFO, the other FIFO is empty, and so the next transmit data can be written to the other FIFO immediately. When both FIFOs are full, EP2 EMPTY is cleared to 0. If at least one FIFO is empty, the EP2EMPTY bit in IFR0 is set to 1. When ACK is returned from the host after data transmission is completed, the FIFO used in the data transmission becomes empty. If the other FIFO contains valid transmit data at this time, transmission can be continued. When transmission of all data has been completed, write 0 to the EP2EMPTY bit in IER0 and disable interrupt requests. |
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